Using a variable to access object member value

Question

I'm trying to access member values of the following class:

public class EditorialDateFormat
{
       public string en; <------ TRYING TO GET ITS VALUE
       public string fr; <------ OR THIS VALUE
       public string Default;<-- OR THIS ONE
 }
public class Params
{
      public string Template;
      public string MainTagID;
      public string[] NavigationFilters;
      public EditorialDateFormat EditorialDateFormat;
}
public class Site
{
      public string Name;
      public string CreationFolder;
      public Params Params;
      public string[] Feed;
      public string Endpoint;
      public string[] TargetDatabases;
}

I could do it easily like : site.Params.EditorialDateFormat.en(for example) but "en" string is actually saved in a variable.

I tried the following code :

// Myvariable contains "en"
object c = GetPropValue(site.Params.EditorialDateFormat, MyVariable); 

public static object GetPropValue(object src, string propName)
{
    return src.GetType().GetMember(propName);
}

But it returns me a MemberInfo object without the member value I would appreciate some help! Thanks in advance

You´re almost there: you have to get the value for the obtained MemberInfo on the given instance of your class, something like : GetMember(propName).GetValue(src, null). — MakePeaceGreatAgain
– MakePeaceGreatAgain, Commented Sep 14, 2018 at 13:26
Not sure but you want en value if null then fr and if that's also null then you want default value right? — Uttam Ughareja
– Uttam Ughareja, Commented Sep 14, 2018 at 13:28

Dmitrii Bychenko · Accepted Answer · 2018-09-14 13:41:27Z

4

You want to read field (public instance field's value), that's why we put GetField:

//TODO: rename the method: it doesn't read property (Prop) 
public static object GetPropValue(object src, string propName) {
  return src
    .GetType()
    .GetField(propName, BindingFlags.Public | BindingFlags.Instance)
    .GetValue(src);
}

edited Sep 14, 2018 at 13:41

answered Sep 14, 2018 at 13:26

Dmitrii Bychenko

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Uttam Ughareja · Accepted Answer · 2018-09-14 13:37:37Z

1

public class EditorialDateFormat
{
    private string _en;

    public string en
    {
        get { return !string.IsNullOrEmpty(_en) ? _en : fr; }
        set { _en = value; }
    }
    private string _fr;

    public string fr
    {
        get { return !string.IsNullOrEmpty(_fr) ? fr : Default; }
        set { _en = value; }
    }

    public string Default { get; set; }
}

and you can use it like var c=site.Params.EditorialDateFormat.en in elegant way

answered Sep 14, 2018 at 13:37

Uttam Ughareja

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1 Comment

Slrg Over a year ago

Thank you for your help!

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